Camera



March 12, 1929. w. A. PETERS CAMERA Original Filed May l2. 1922 4 Sheets-Sheet,

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March 12, 1929. w. A. PETERS CAMERA Original Filed May l2- 1922 4 Sheets-Sheet 2 March l2, 1929. w. A. PETERS CAMERA original Filed May 12. 1922 4 Sheets-Sheet J@ @fm Marh l2, 1929. wl A PETERS 1,705,027

CAMERA original Filed May 12. 1922 4 sheetsshet 4 Patented lWar. 12, 1929.

UNETIE-D; ern-TES 'rP TEN T F FEC E 'WILLIAM'..LA -PETERSfOCEICAGOQILLINOI ASSIGNOR T0 INTERNATIONAL PATENT LICENSING'-CORPORATIONf 01S"A CHGAGO, 51111110155 A1 CORPORATION OF ILLINOIS.

explainationv ieqmeyiz, 1922, serial Ne 56o,4o6. Renewed November 11, 1927.

'My invention relatesfto improvements in cameras. and hnsspe'einl reference 'toump rovemcnts m camerasof the roll Iilm type,

particularly as shown 'in LettersfPatent of the vemberl 1,. 11921. r

'The object of. my present'invention is to provide simple interlocking and cooperating part-s and mechanisms whicli'iwill. greatly'v simplify; the manipulntionof 'the camera u nd will positivelyl prevent the :premature or 1na'dvert-ent operation of ceiztninparts-of'the servationz'oA the .image rwhena, rear camera door is openedandout -of|the .focalplane when the rear camera door 1s closed.

4In mylpresent InventionV I. provide interrelated mechanisms .which Acooperate .to 'produce -thefollowing results. lFirst to prevent the openine of the rear or ground glass door to expose t le ground :glasse whenthe camera. Abellows support iswithin thecamera or in other words in closed position.- This is for preventing :the `streii'iing ofthe..parts, forV when the bellows frame is in closed or retracted position thereis not Sufficient room within the camera to4 ermit the forward positioningr of the groun 'glass which is accomplished nutoinzitirnliy upon the opening of' the ground glass door. Second, to .positively prevent the openingfof the ground glass door to expose the Afilm when the camera is open for use and the film is extended to any extent :it all. Third, to prevent the extension :of the lna to :any amount when the ground glass door, or'in other words, the rear door of the (temere ense, is open.

A further feature ol importance is to prolide rigid support-s for the ground glass frame to prevent the 'distortion of thel frame :md possible bread-:ing ofthe ground glass should the bellows support lle inadvertently pushed .buck into the mineraraf-:e when the rens' or ground glass door is open and the ground glass is positioned forwardly in the cese 'for observation purposls ,My invention will hq more. readily underg tional view on the line 4 4 of Figure b;

a camera'justwithin one side, edge thereof and substantially on the. line 1 1 of Figure' 2, the bellows,l .bellows support, and lens vboard :ind mechanism being shown in extended position in dotted. lines;

' Figure 2 is a fragmentary rear view of the I'lower end of the camere;

Figure 3 is a view similar to Figure .2 the rear wallor'door frame being removed to expose some of the int-erloc-kinnr mechanisms;

.Figure 41s a. fragmentary'lhorizontal sec- Figures 5 .ando are vertical fragmentary sections on the line 5 5 1nd 6 6 respectively 'of Figure 3;

Figure 7 is n-"hoi'izontl sectional View of camere on thelin'e 7 7 of F ignre l;

Figure 8 is :L 'fragmentary vertical sectional View on the line 8 8 of Figure' 7;

Figures 9' and 10 are perspective views of two of the operating levers;

.Figui-'e 11 is e, fragmentary vertical section of the' iezii,wall ofthe camera case particularly illust-rating, the operation of the ground glass and the rear door;

Figure 12'is a.fragmentniy.1')lan view .of

the rear or groundgless doornnd thefrnme which carries it es seen 'from the inside;

lFigures 13 and 14 are 'fragmentary horizontl sectional viewson the lines 13 13 and 111-14 respectively (5f-Figure 12;

Figure 15 is, a .perspective view of. one of the pivote'd operatinglat'eh members; und

Figure 16v is a fragmentary rezir elevation of the mechanism 'foriloeking the ground glass door closed when the 'film is extended.

A's illust-rated' in the drawings the remera 1 which I 'have chosen in which to present :in embodiment of my invention is of the pocket type. It has :i sheet metal case 2.whieh is adapted to he closed into :L flat elongated con- .dition of :i suitable size to he received in :i

largcpoeket or to he carried hy hund. The ease 2 comprises n front wall 3, ai rear wall 4, .half circuler ends 5 and 6 and flat side walls 7 and 8. The front wnll is provided `with a door 9 adapted to close o, rectangular opening l0, (he door being hinged at its hott-om edge 11 :ind adapted to open downwardly to the ,position 'shown .in dotted lines in Figure l to provide a horizontal support upon which the llfl leus boa rd and niechanis'iii 12 `='ist 4sup'fport'ed lwl ien vthe bellows V13`1s extended. `'The rear end of the bellows is'secured to a rectangular' 4iframe-.14 whichis adapted fto be maintained parallel to thefront and-'back of the caseand to be moved from a. position adjacent to the rear wall of the case when the camera is closedto a positionadjacentto the, front wallofthe case when the camera 1s open by means of guides and mechanism whielritis not thought necessaryfto illustrate ,or describe these, do "not comprise part of the present invention ,except in; so fa.r as said niechanismsfenterlinto A combination with other me;hani sr 1s;l ierein- .'uflnfullydeScribd; .f v The reafr, \vfall 4: zi-@rect gular'opemng 'provided with a. rectangular which Vis adapt-ed tobe'close'd'byfa hingedfcover 18.

ground glass coveror rear door andjadj'acent to ne' from. 1 6 wenn t ieeiseihqre, igerranged a plate of ground 19,' tlieforwad face 20o5 whichis smoolll therearace 21 of whiclris,groundi eculiar mounting of the ground glass plate [1n .conn'ectioivith the groundA glass lcoveijH-lS .be described more fully hereinafter. The 'frame 1,6 is.-- se cured lto the casing. byvsuitable {screws'- Below mening@ 11 brule front door 9 the case is provided witha pocket 23,for containing two film roll f ra.'me s, 24 and 25. f These framesar'e adapted tocarry aflmf26.wound on central'shafts 27 in-,the casiiigs 25 and in Vthe Vcasing 24.v Thes'efcasings are'moxfable bodily' from the pocketj23 up into the Ecasing of the ycamera and Aare adapted A to belvpositioned with the film As tryatcliedbetweenthem centrally in relation to ythelen'srmounted on tbe lens mechanism I Asdescribed in my sa id Patent No, 1,395,295, mechanism .isprovided for unrceling and reeling lup the film for exposingportions having Adifferent lengths according to the sizei'ofgpi'cture desired, it bcinglhought vunnecessary to -fully describe .such mechanism ilrthisapplication.

.--.s best shown in Figure-1the framel4 to which the bellows 13 is attached is situated close to the rear wall of the camera vc ase when iu its closed or retracted position leaving only suflicieut. room between the lframe and the back of the case for the ground glass late 19 :1nd ils frame. As explainedfhereto ore the forward face 20 of the ground glass plate is smooth so (hat when the film ismoved in relation thereto, the friction willl be minimized auzl the rear face 21 is ground for the purpose of causing the image to appear. .As the film when exposed lies against, the forward face of the glass it is necessary in order to produce a sharply defined image on the ground or rfear face of the glass to project the glass plate bodil y forward into a posit-ionwhere Aits rear fac-e lies in the focal plane. In Letters Patent of the United States, No'. 1,374,678, issued to me .-Apil 12,1921, describe and/claim inea-ns for 'thus projectingthe ground glass plate forwardly when the rear or ground glass door is vI opened'a'ndlit will now'be understood-that in orderv to preventfstraining of vanyof-thezparts it is desirable to prevent the opening of the f3-door 18 when the frame 14 is in its rear or closed position as shown full lines in Figure'l.Forithispurpse,"niake use of a l.swinging guide r ail 30, see Figure 1, pivoted at 31 to al rigidprt of 'thecasing 'at one side `A adjacent to 'the forward door 9 and provided fwith allongitiidinalslot'32 for receiving a guide 'pi'n 33 mounted'rigidly on said frame i 14 and projecting' laterally therefrom. This swingingguide rail is adapted to beswung 4to.''.f.1..h irlzfintllally rearwardly. Pro1' @sting .P04 sition'asfshownin 'Figure 1 sparming the case fron'1 fr ont to rear when "the frame 14, is pushed back in the case.' f Tli'is'gllide'rail and its several functionsand'operation's is fully f describedand claimed in Letters Patent of the United States No. 1,292,036 issued to me Jan. 21, `1919. `vThe forward'end 34'of the slot 32 is provided with ani offset notch which L ends tothe rear of the pivot 31'andf`wheieby 1 the guide rail is adapted to be swung' to'vertifcalA position"wlien the frame' 14 reaches its fo'rwardiposition adjacentito the .front wall of the casing'asthe. lens boardis dra-wn out. The rear end 35 of the guide rail30 isa'da ted lto'enter alateral 'notch 36 in a bracket 37 'ized to the 'rear wall of the casing adjacentto the framelf" Aff "'f" "g i' As the frame 14 is moved rearwardly inthe cz'ising and lswings the guide ril downwardly, the rear end conta-cts with 'a shoulder 38 constituting the lower wall of said notch 36 and thereby the guide rail'is positioned horizon- "tally. The upper end'39 of the ixedbracket 37 is beveled as shown in Figure 16 to permit lthe rear lend 35 of the guide'rail 30 to enter the notch 36 as it is swung downwardly. This,

swinging guide rail -has an importantfunction to perform relatively. to the opening of theground glass door 18 which will be described hereinafter. i The lower end 40 of the frame 16 which carries the rear or groundglass door 18 is opposed to a. vertical flange 41 forming part of the rear wall of the casing and between the two I provide a. space 42 in which I arrange a. pivotcd lever 43 for locking the door 18 in its closed'position. This lever, as best shown in Figure 3, is pivoted at a. point 44 between its ends tothe flange 41 and is provided on one end with a, thumb piece 45 which is ex- A posed as best shown irl-Figure 2 at the right hand edge of the back in posit-ion to be operatively engaged by the. thumb of the right hand of the user of the camera when holding the camera .in normal vertical position for taking a picture.

.T he adjacent side wall 7 of the camera is provided with a depression 45 in its rear edge the lower end of the door 18 .'mdprojecting` inwardly from the inner surface thereof. The 1 projection 48 has Aa rounded head 49 spaced from the innersurfaceofthe door and the' "the head'f49 and'rctain the 'door in'closedposi-v tion. f The'inner end of the lever 43 is normally held vertically and in locking position" -by a: spring 50 made of spring wire, one end 51 of whiclris adapted to press downwardly :on-aledge i' 2 formed in the easing and definv`ingtheopening in which the frame 16 is arranged. The-spring 50 extends transversely of the casing and between its ends is bent up;

projection 57 at the inner end of the lever 43,

(ill

saidspring extending beyond said projection in a downwardly direction and provided with a sharp downwardly formed. bend 58 adapted to enter a small depression '59 in said ledge 52 -lo retain the spring in its normal position. The end 60 of the springwhich is opposite to `the end 51,' that is the -end beyond the bend -upwardlyi'n f position to retain'thedmr 18 locked against opening andthe outer end is nca-molly1 heldA downwardly-with the lower end of the thumb piece45 incontact with thel shoulder 61 at the'lower end of the notch 46.

The outer end of the lever is providedwith' an eupwardly extending 'projection 62 vprovided onits inner edge with anotch' 63, the function of which will vbe described'hereinafter. 'Above the notch 63 the projection 62 is bent inwardlyproviding a shoulder 64 for contact. with the` lower edge 65 of the part 66 which forms thc lower wall of the notch 36 in the fixed bracket- 37. Vhen the outer end of the lever 43 is swung upwardly to release' the door the shoulder 64 contacts with the lower cud (i5 of the. fixed bracket 37 to limit this upward swinging movement of the levcr 43. lV hen the lever. 3 is allowed to swing as dcmrribed its inner end is withdrawn from hein-ath the lmad'49 of the projection 48 and the door is released. Above the shoulder 6-1 (he outer rnd ot the lever is provided with a vertical projection 67 which extends upwardly into substantial contact with the lower edge of the tree end 35 ot the swinging guide rail 36 as best shown in Figure 1. Conscquently when the-guide rail is in the rear- 'ai'dly extending position shown in full lines in Figure 1, that is, when its rear end is in the notch 3\ the lere-r 43 is reta-ined in its door locking position 'and'cannot be. swung The inner end V46 of the' lever 43v "to release-the door.' At the time that the arts arc in the position described, the frame 14 is arranged close against the ground glen-5s and if the door v .nepermittcd to swing open att-his time, t" ground glass and its frame Wcuirlbe forced against the bellows frame 14 and' tlie'canneraf might 'be injured. Atsuch tiin'ethe'pfi'hn and vits casings are obviously arranged'inthe pocket 23 as-show-n in full lines in' Figure l1.

I preferably make'the cameracase of alu- 4minum forth'e purpose ofmaking-it ass-light 'in'wcight I11s-possible and for finishing the outer surface 'I cover the oase with leather. As the case-is made of aluminum which is relatively-soft the loottom of the notch or de- `pression'4ti'= in` which the thumb piece 45 moves nfiightwearl rapidly as the lever 43 is preferably made o1" steel. To prevent e.\' cf'ssiveruit-ar=atI this point, I provide a. harder :metalstrip=54held on the'bottom of the. nota-h 45. 'Iliisistrip is preferably'made of brass or mmeothervsnitable metal harder than alu- "minmnfaledl presents a bearing surface to thc thumlr piece 45.

As full).- described in 4my said Patent No. 1,395,295, the xfilm casings are adapted toA be lifted from the pocket to positions within the casing to properly exposethe desired areas of' films but obviously this cannot occur unl il the lens board has been withdrawn from the casing and theV bellows frame 14 has been moved to the forward side of the casing thus swingingfthe'guide rail-30 to "ertical position out of the way of the film casings.

Upon 'consideration it will be obvious that the rear door 18 should never be opened at times when the film would be exposed to light which wouldenter through this rear opening. I therefore provide associated-looking parts which positively prevent the door unlocking movement of the lever 43 at times when the upper film casing 25.is raised to any extent from its retracted position shown in full lines in Figure 1.

On the end wall 68 of the casing 25 of the film roll 27 and which is adjacent to the projection 62 of the lever 43, I provide a rigid bracket 69 which carries a. cam projection 7() ha 'ing a rounded inner cam su rface 71. This cam member is moved upwardly when the film casing 25 is moved upwardly and when the casing is in its lowermost position this cam surface contacts with an upwardly projecting arm 72 on a bell crank lever 73 pivoted to the casing at its heel on a suitable piv t 75 to swing in a vertical plane. The opposite end 76 of this bell crank lever is engaged by the end 60 of the wire spring 50, the arm 76 being provided with a perforation 77 to receive the end of the spring. The spring tends to hold the arm 76 upwardly and the opposite arm 72 of the bell crank lever in Contact with the cam 70. The upper end 72 ot this lever h; i horizontal projection'which vis vieldingly held outwardly to place said project-ion 78 in the notch 63 of the.l door locking lever 13. This engagement of the projection 78 occurs when the casing is lifted suficiently to disengage the cam from the arm 72 of the lever 73, and when the projection 78 is in the notch 63 the outer end of the door control lever cannot be lifted and consequently the door cannot be unlocked. As best shown in Figure 15, the outer edge of the upper end of the arm 72 is rounded to permit an easy engagement of the cam with the lever arm .72 when the cam is pushed downwardly'. When the cam is at its lower position, the arm 72 with .the projection 78 is forced inwardly against pressure of the' spring 60 and the projection 78 is swung out of the notch 63 thereby permitting the door locking lever 43 to be operated.

It is to be noted that all of the locking engagements in relation to the movements of levers are positive shoulder locks and do not depend upon frictional engagement of the parts. Also that in each instance, a very slight movement of the interrelated parts is pro vided for to assure clearance in the closing and locking movements Awithout friction or binding. Y

In Figure -11 I have shown a sectional view which illustrates the automatic movement of the ground glass .plate when the rear door is opened. rlhe door '18 is hinged at its upper end tothe upper part of the frame 16 at 79 and is provided with rigid extending lever parts 8O which project throughopenings in v`an ripper .part 81 of the frame 82in which the glass is mounted. The free ends of these projections 80 carry a rod 83 which is adapted to engage the rear face of the projecting part 81 on the frame 82 and as the door 18 is swung shut to draw the frame 82 outwardly toward the hac-k Wall of the camera casing the projections 80 being formed to engage the inner face of the said upwardly projecting part 81 to `.force the frame away from the back ol the case when the door 18 is swung open. The lower end 84 of the frame 82 is hinged to the frame 16 by a swinging wire lever 85 pivotally mounted in the frame 16 so that when the door moves the upper end o'l the ground. glass frame inwardly and also dou'nu'ardlj", the lower end is likewise thrown inwardly. In other words. the ground glass is maintained parallel with the hack of the casing at all times.

'lo provide a. suitable dept-h on the frame 16 to receive the frame 82 ot' the ground glass, the frame 16 is provided with an inwardly extending' Flange 86 surrounding the opening which receives the cover 18 and this flange 86 is provided with an outwardly extending edge flange 87 at its inner dge. The fiange 87 forms a llat surface surrounding the opening occupied by the ground glass frame and for positively supporting the lower end of the frame against Vany pressure which may he brought to bear against the frame by the hellows frame 14, hy an inadvertent movement. to the rear ofthe bellows frame 14 when the reardoor'is open and the ground glass lis orward,I provide the ground glass frame 82 With-rigid lateral projections 88 near its lower end adapted as shown in Figures 8 and 12 to rest upon the inner surface of the liange 87 when the-ground glass is projected for wardly.

To positively prevent any outward movement of the easing 25 of me lihn roll 27 when the rear door 18 is open, I provide a horizontally swinging stop lever 99 pivotally mounted between its end en the lower end 40 of the frame 16 and having one end 91 adapted to be projected inwardly to engage a horizontal shoulder 92 on the wall 68 of the film roll casing 25 see Fig. 8. AFor yieldingly holding the end 91 projecting over the shoulder .92, I provide a U-shaped spring 93 mount-ed within the channel 91 formed by the flanges 86 and 87 and haring an end 95 projectingr back of the end 91 of the lever 90, the lever beingprovided with a notch 96 in its inner end for receiving the end 95 of the sprin". The opposite end 97 of the lever 90 is provided with an inwardly extending projection 9S which projects into the path of the lower end. of the door 18 as the same reaches its closed position. As the door 18 is swungr to its closed position its lower end engages the projection 98 of the lever 90 swinging the end 97 of the lever inwardly and consequently the opposite end 91 outwardly and in thus swinging the end 91 outwardly, it disengages said end from the shoulder 92 on the film casing and permits said easing 25 to be moved in the camera casing.

It will now be understood that while the bellows fra-me 14 is in its rear position, that. is adjacent to th'e rear wall of the camera the rear or ground glass door cannot be opened for the reason that :d such' time the swinging guide track is in its horizontal position and the door locking' lever 43 is prevented from unlocking the door. Further at times when the fllm is extended, or in other words the film roll casing 25 is moved in- -ward to any extent the door cannot be opened for the reason that the locking projection 78 on the bell crank lever 7? engages in the notch 63 in the door lock lever 43 and prevents its opening movement. Further7 when the rear or ground glass door is opened the film cannot be extended. In other words, the roll film casing 25 cannot be moved to any extent at all for the reason that the end 91 of the locking lever is projected over tlu-v shoulder 92 on the end wall 68 of the lilm roll casing 25. It. is to be noted that. the outer end 91. of the lever 9() bears against. the lower end 99 of the inner flange 82 surrounding the opening 15 in the back wall of the casing so lli() that if it is attempted to lift the film roll casing 25 when the rear'door is open, this lever 90 cannot oe bent by pressure from the film roll casing as the projection 9S is almost directiy in line with the shoulder- 92 and is in the best position to take the thrust without damage.

As many modifications of my invention will readily suggest themselves to one skilled in the art, i do ot limit or confine my invention to the specific details of construction or to the specific combinations of mechanisms herein shown and described.

I claim:

l. ln a camera of the kind described, a ground glass plate arranged adjacent to t-he rear wall of the camera, a rear hinged door for covering the plate, a bellows frame arranged adjacent to the ground giass plate when the camera is closed and;movable toward the front wall of the camerawhen the camera is open, means for niountingthe plate and connecting it with the door `so that as the door is opened the 'plate is moved forwardly in the casing, andz means operable by the bellows -frame for locking the doorfin closed position when the frame is adjacent to the groundglass plate.

2. In a Acamera of the kind described, a

ground glass plate arranged adjacent to the rear walllol the camera, a rrear hinged door ior covering the plate, a bellows frame arranged adjacent, to 'the ground glass plate when the camera is closed 'and movable-toward the frontwall of the camera when-the camera is open, means for mount-ing the plate and connecting it w-ith the door so that as (he door is opened 4the plate is -moved forwardly in the casing, a guide rail= for thev bellows frame pivoted at -the front ofthe;

camera and adapted to be swung across the can'xera casing when..the frame i'sfmoved to' camera closedY position, a locking -lever'pivot- :illy mounted on the casing orinormally,

retaining the rear door locked shut, the free cnd of said swinging guide rail being arranged to prevent the door unlocking movement of said pivoted lever when the bellows frame is in its rear position.

In a camera ofthe kind described, a ground glass plate arranged adjacent to the rear wall of thecamera, a rear hinged door for covering the plate, a bellows frame arranged adjacent toI the..ground'glass plate when the .camera is closed'and movable -toward the front wall of the cameraww'hen the camera is open, means forfmoufnting the platevand connecting it withfthe =door so that as the door is opened the plate` is moved forwardly in the casing, a sp-ringpressed lever lpivotally mounted on the casing for.

normally maintaining the rear door locked shut, `said locking lever having a thumb piece ojicrable from withoutthe camera casing to unlock the door, a swinging guide rail for the bellows framepivotally mounted on the frontwall ofthe camera casing and adapted to be positioned across the casing when the bellows frame is .moved rearwardlytherein, and a` projection on said' locking lever adapted to engage the rear end of said swinging guide rail to prevent the unlocking movemento-f said lever.

'4. Inga camera of the kind described having film roll .carriages .movable within the camera casing` for positioning a film in the focal plane and also adapted to be closed together in a pocket invone end of the camera-casing, a rear door for :the camera casing, a ground glass plate adapted to be positioned in and outotl the focal plane by the opening and closing of the'rear door, and means preventing the opening of said door at times when the film roll carriages are not fully retracted into 4said pocket. Y

5. l In-a camera of the kind described having i film roll ycarriages movable within the camera lever having a notch, apivotally mounted coopera ting lever havingla projectiony normally retained in'said notch toprevent the door re.- leasmg movement of said locking -leverand means operable-by one of said` film roll car-V riagesasv it reaches its retractedv position. to withdraw said projection from said notch as and for the purpose specified.

6. In a camera of the kind described having film roll carriagesmova'ble within .the vcamera casing-for positioning a film in the focal plane and also adapted to be closed together in a pocket in one end of the-camera casing, a rear door for the.. camera casing, a ground glass plate adapted to be positioned in andout of the focal plane by the opening. and closing ot' the rear door, a locking lever for the door pirotally mounted on the casing one end of said lever having -a notch, a pivotally mounted cooperating lever having a projection normally retained in said notch to prevent the door releasing movement of said locking lever, a cam projection rigid with. one of .Said carriages adapted to contact with said cooperating lever `and withdraw said projection from said notch as the carriage reaches lits retracted position as and forthe purpose specified.

7. In a cameral of the kind described., having film roll carriages movable within .the camera casing-to position a section of film in the focal plane, a rear door for the camera casing, a ground glass plate within the casing arranged to be moved into and out of the focal plane when the rear door is opened andclosed, a lever pivoted between its ends on the casing,

one end thereof arranged in the path of the door as it closes, the opposite end of the lever movable into and out of the path of a part of one of said film roll carriages, and adapted when the door is open to lock the carriages against movement in retracted position and to release the carriages for movement when the door is closed.

8. In a camera of. the kind described having a casing made of a relatively soft light metal such as aluminum, the casing having a rear door, a lever normally holding the door locked in closed position, the lever provided on one end with a thumb piece arranged in contact with the'outer surface of the casing, and ametal stri p harder than the casing arranged beneath said thumb piece to prevent the wearthumb piece.

9. In a camera of the kind described, Ya bellows frame within the camera movable from a retracted position adjacent to the rear wall to accamera open position adjacent tothe front Wall, film| roll carriages movable `fromr` a retracted position in a pocket at one endl of the camera casing to separated positions 1n the camera case to position a section of film inthe focal plane, a ground glass plate adja-y means for preventing the rear door opening when the bellows frame is in its rear position, and means for preventing the opening of the door when the inner'flm carriage is moved inwardly from its fully retracted position.`

10. In a camera of the kind described, a bellows frame within the camera movable from a retracted position adjacent to the'rear wall to a camera open position adjacent to the front wall, film roll carriages movable from a retracted position in a pocket at one end of the camera casing to separated positions in the camera case to position a section of film in the focal plane, a ground glass plate adjacent to the rear wall of the camera, a rear door for exposing the ground glass plate, connection between the ground glass plate and the door for positioning the ground side of the plate in the focal plane as the door is opened and retracting the plate as the door is closed, means for preventing the rear door opening when the bellows frame is in its rear position, and means for preventing movement of the film carriages from their retracted positions when the door is open.

11. In a camera of the kind described, film roll carriages movablefrom a retracted posi'- tion in a pocket at one end of the camera casing to separated positions in the camera case to position a section of film in the focal plane, the casing having a rear door, means for pretoia camera open position adjacenttothe front Wall, film roll carriages movable from a' retractedlposition 1n a'pocket at one end of the camera casing to separated positions in the camera case to position a section of film m the focal plane, a ground "glass plate adjacent to the rear wall of the camera, a rear j door for exposing the ground glass plate, coningof the casing by the movement of said nection between the ground glass plate and the'door for positioning the ground side of the platelinAthe focal plane as the door is opened and-retracting the plate as the door'is closed, means'for preventing the rear door opening when the bellows frame is in its rear# most position,vmeans for preventing the opening ofthe door when the inner film carriage is moved inwardly from-its fully retracted l position, and means 'for= preventing movement of the film carriages from theirretracted positions when the door is.open.z

13. Ina camera-'ofthev kind described, a groundfrlass'plate arranged adjacent to the rear Wa of the camera, a rear hinged door for covering the plate, a bellows frame arrangedadjacentfto the ground glass plate when thecamera is 'closed and movable -to- Ward the front Wall ofthe camera when the camera is open, means for mounting the plate and'connecting it withthe door so that as the door is opened the plate is moved forwardly in the casing, and means for locking the door in closed position when the frame is adjacent to the ground glass plate.

14. In a camera of the kind described having film roll carriages movable Within the camera casing for positioning a` film in the focal plane and also adapted to be closed together in a pocket in oneend ofthe camera casing, a rear door for the camera casing, a ground glass plate Within the camera arranged to be seen when the rear door is open, and means preventing the opening of said door at times when the film roll carriages are not fully retracted into said pocket.

15. In a film'camera, a pair of film carriages movable transversely of the camera case to position a'section of film in the focal plane and to Withdraw the film out of the focal plane and into a pocket, an image ohservation plate within the case, a door at the hack of the case for opening to observe the image, the observation plate mounted for movement into the focal plane as the door is opened and out of the focal plane as the door is closed, means for locking the door shut when the film carriages are not fullv withdrawn into the pocket, means for locking the film carriages against Withdrawal when the door is not closed tight, and means for locking the door` closed When the camera is open.

16. In a film camera of the kind described, having a bellows frame adapted to be positioned adjacent to the rear Wall of the camera case when the case is closed and to be moved to a position adjacentto the front Wall of the case when the case is open for use, a painof film carriages movable transversely of the camera case to position a section of film in the focal plane and to Withdraw the fim out of the focal plane and into a pocket, an image observation plate within the case, a door at the back of the case for opening to observe the image, means for locking the door shut when the film carriages are not fully Withdrawn into the pocket, means for locking the film carriages against Withdrawal when the door is not closed tight, and means for locking the door shut when the bellows frame is in its rear position.

17. In a camera of the kind described, a rear door, an image observation plate, a bellows frame positioned adjacent to the plate when the camera is closed and away from the plate when the camera is open, interlocking mechanism and parts to prevent the door being opened when the film is extended, also when the camera is closed and, to prevent the .extension of the film When the door is open and also when the camera is closed.

Signed at Chicago, Illinois, this 25th day of April5 1922.

WILLIAM A. PETERS. 

